/**
 * 设置cookie
 * @param {cookie键} c_name 
 * @param {cookie值} value 
 * @param {cookie过期时间} expiredays 
 */
export function setCookie(c_name, value, expiredays){
  var exdate = new Date();　　　　
  exdate.setDate(exdate.getDate() + expiredays);　　　　
  document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
}

/**
* 获取cookie
* @param {cookie键} name 
*/
export function getCookie(name) {
var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
if (arr = document.cookie.match(reg))
  return (arr[2]);
else
  return null;
}

/**
* 删除cookie
* @param {cookie键} name 
*/
export function deleteCookie(name){
  var exp = new Date();
  exp.setTime(exp.getTime() - 1);
  var cval = getCookie(name);
  if (cval != null)
    document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
}